Abstract
This paper presents a study on the effect of hydrothermal treatment (HTT) on municipal solid waste (MSW) and mechanical property of fuel pellet. The lab-scale HTT was conducted at the condition of 180–240 °C and 30–90 min. Results showed that the HTT could improve fuel property of MSW including heating value, dewatering and drying performance. The fuel pellet was produced at three different diameters (4, 6, and 8 mm). Tests of mechanical property and water adsorption were performed. Results showed that the fuel pellet was able to withstand the axial load of 19–54 N and the radial load of 72–130 N. The 8-mm pellet exhibited lowest Young’s modulus (18.26 MPa) indicating flexibility and ductility. Durability of the fuel pellet was high (91–94%) while the Hardgrove Grindability Index (HGI) was (57–76) higher than that of the biomass pellet (18–22) and the subbituminous coal (46–49) indicating the ease of grinding. The equilibrium moisture content of the fuel pellet was 5–6%. The small fuel pellet reached adsorption equilibrium faster than the large one. In sum, the fuel pellet produced from HTT showed good fuel property as well as mechanical property for transportation and utilization.
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